Stick a heavy-duty suction cup near each of the two top corners of the glass panel.

To attach the suction cups, first position the suction cup with the movable handle parallel to the face of the glass panel (as highlighted in the second picture).

While lightly holding the suction cup against the glass, raise the movable handle until it is parallel with the other handle (as highlighted by the third picture).

If your suction cups refuse to stick, try cleaning both the glass panel and the suction cup with a damp soft, lint-free cloth. (Dampen with distilled water, and if needed, an equal ratio of distilled water and white vinegar for best results.)

Do not use the suction cups to carry the display glass because if one of them fails to stick, you could drop the screen and break it.

The original iMac box makes a good place to store the glass panel. Otherwise, a padded horizontal surface, like a towel on a desk will do nicely.

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Gently lift the glass panel perpendicular to the face of the LCD enough to clear the steel mounting pins attached along the underside of the top edge of the glass panel.

Pull the glass panel away from the lower edge of the iMac and carefully set it aside.

Don't use the suction cups to carry the glass panel—if either one loses its grip, the panel could fall and break.

After setting the glass panel down safely, be sure to release the suction cups, as the suction force over time, can crack the glass.

During reinstallation, be sure to meticulously clean the inside of the glass panel and the face of the LCD as any dust or fingerprints trapped inside will be annoyingly visible when the machine is turned on.

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Due to tight tolerances, you will have to use a thin hooked tool to lift the display out of the outer case. As seen in the third picture, we made one out of a bent paperclip.

Use a thin hooked tool to lift one side of the top edge of the display by its steel outer frame.

After lifting the top edge of the display on one side, hold it out of the outer case while you use a hooked tool to lift the other side. A pencil or pen can be placed under the top edge of the display, parallel to the top edge and extending past the edge of the computer, to keep the first side propped up while lifting the second.

Do not lift the top edge of the display out of the outer case too far, as several short ribbon cables still connect the two components.

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Use a pair of tweezers to pull the vertical sync ribbon cable out of its socket on the LED driver board near the top left corner of your iMac.

On some iMacs this may not be a ribbon cable but four separate, very fine and very fragile wires. Be very careful, if the tweezers slip off the plug, you will very likely pull a wire out of the assembly.

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Lift the display for enough clearance to disconnect the LCD thermal sensor cable connector from its socket on the logic board.

If your fan is spinning full speed after completion, check this connection or the hard drive's thermal sensor cable. The thermal sensor connector socket is very fragile, so be very careful when you connect back the sensor cable.

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Before disconnecting the thermal sensor cable, take note of its orientation. It is extremely important to reinstall the connector in the current orientation so the fans will not run at full speed. If you have multiple pins on your replacement hard drive, put the connector closest to the SATA connections and closest to the PCB board.

Disconnect the thermal sensor, SATA power, and SATA data cables by pulling their connectors away from the sockets on the hard drive.

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While putting the system back together, I recommend untaping and removing the vertical sync cable from the back of the led screen. Plug it back into the LED Driver board and then into the back of the screen. Reapply the tape and continue reassembling as normal. It is far easier to plug it back into the screen than into the driver board through such a small gap.

My hd failed and i used this guide to replace it with the same model. The problem i'm stuck with now is installing os x again. The installation starts and goes on for a while, while the hard drive makes a weird clicking noise. Then randomly the installation fails and asks to try again. I've done this ten times now.

I'm not here to rant though, i've some useful tips as well.

Instead of buying suction cups, i used a vacuum cleaner inserted into the back of a plastic container to create more pressure per inch. Also used duct tape on edges of the container to create more friction and not damage the glass. Although later i noticed you could wedge the sharp edge of a knife between the glass and the case and widen the gap with a fingernail, then pull the glass out completely.

A note when you're buying screw drivers... The ones with the interchangeable bits won't reach the screws on the lcd, so be prepared to fiddle with strips of paper and screws falling into the sides!